What is quantum information?

Quantum Information

In quantum mechanics, quantum information is physical information that is held in the "state" of a quantum system. The most popular unit of quantum information is the qubit, a two-level quantum system. However, unlike classical digital states (which are discrete), a two-state quantum system can actually be in a superposition of the two states at any given time.

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Some articles on quantum information:

Raymond Laflamme
... and the co-founder and current director of the Institute for Quantum Computing at the University of Waterloo ... Laflamme is currently a Canada Research Chair in Quantum Information ... Among his significant scientific works have been his work in quantum computing and quantum information theory ...
Time-evolving Block Decimation - Introduction
... There is nowadays a considerable interest in the field of quantum theory for computational methods well-suited to the physics of many-body systems ... Considering the inherent difficulties of simulating general quantum many-body systems, the exponential increase in parameters with the size of the system, and correspondingly, the high ... dealing with all the parameters used to fully characterize a quantum many-body system is seriously impeded by the lavishly exponential buildup with the system size of the amount of variables ...
Markus Aspelmeyer
... Markus Aspelmeyer is an Austrian quantum physicist ... and then, Junior, later Senior Researcher, at the Institute for Quantum Optics and Quantum Information (IQOQI) of the Austrian Academy of Sciences where he is leading a ... His research interests are quantum entanglement and quantum optics ...
Superconducting Quantum Computing - Journal Articles On Superconducting Qubits
... Quantum coherence with a single Cooper pair "Quantum Coherence with a Single Cooper Pair" ... "Coherent control of macroscopic quantum states in a single-Cooper-pair box" ... "Quantum-state engineering with Josephson-junction devices" ...
Quantum Information Theory
... The theory of quantum information is a result of the effort to generalize classical information theory to the quantum world ... Quantum information theory aims to investigate the following question What happens if information is stored in a state of a quantum system? One of the strengths of classical information theory is that physical ... This is because it is always possible to efficiently transform information from one representation to another ...

Famous quotes containing the words information and/or quantum:

    Information networks straddle the world. Nothing remains concealed. But the sheer volume of information dissolves the information. We are unable to take it all in.
    Günther Grass (b. 1927)

    The receipt to make a speaker, and an applauded one too, is short and easy.—Take of common sense quantum sufficit, add a little application to the rules and orders of the House, throw obvious thoughts in a new light, and make up the whole with a large quantity of purity, correctness, and elegancy of style.
    Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)